Compact Pressure Switches Session 2 Week 2 Agenda

Compact Pressure Switches: Session #2

Week 2 Agenda u u Factors in selecting a switch Accuracy vs. long life Gold contacts vs. silver Product Detail: n n u 2 MSPS E 1 S 7000 96200 Applications

Factors in Selecting a Switch u u Size Accuracy n n u Adjustable Range n u Limited by physical constraints Adjustability n n 3 0. 5% to 2+%, depending upon type of technology Trade-off for higher accuracy is generally larger size Mechanical switches can have fixed or adjustable set points Ease of adjustment must be considered

Factors in Selecting a Switch u Deadband (Hysteresis or Actuation Value) n n 4 Can be fixed or adjustable, depending upon switch design Narrow deadband is typically required in safety services or alarm circuits Wide deadband is usually OK for control circuits such as hydraulic units Can be difficult to control on mechanical switches (physical constraints)

Factors in Selecting a Switch u Cycle Rate and Life Cycles n For mechanical switches: Cycle rate typically limited to 25 actuations per minute or less n Useful life typically 1, 000 cycles n u Other Considerations n n n 5 Proof pressure Number of switch points required Housing type (NEMA or IP ratings required) Does application only need basic on/off capability? Applications not using PLC

Accuracy vs. Long Life u For greatest accuracy and longest life, stay in the “Green Zone” (Zone A) n n 6 Zone C = Longer Life Zone B = Higher Accuracy

Gold Contacts vs. Silver u Gold contacts are an option on most compact switches u Why use gold contacts? n n n u 7 Contacts build up oxidation over time; in high current applications oxidation is burnt off In low-current applications (PLC’s or DC current) oxidation is not burnt off as quickly, causing premature failure in silver contacts Gold contacts do not build oxidation as quickly Key question to ask: “Is this high or low current application? ” If low, consider gold contact

Gold Contacts vs. Silver u Example of carbon buildup in a low-current application using silver contacts Cutaway view of contacts in microswitch 8

Product Review: Series MSPS n n n n n Small size Easy external set point adjustment Factory set or field adjustable NEMA 1 & 4, UL & CSA approved NSF-approved diaphragm for Food & Beverage Housed version available Accuracy ± 2. 0% of adjustable range Pressure range 0. 5 -100 psi Average list price: $40 - $55 Applications Pool & spa heaters n Beverage dispensers n Medical gas delivery systems n General industrial applications n 9

Applications n n n n n Product Review: Series E 1 S Small size Easy external set point adjustment Factory set or field adjustable Optional adjustable deadband UL recognized & CSA approved Wide range of process connections Accuracy ± 2. 0% of adjustable range Pressure range 0. 5 -500 psi Average list price: $60 - $80 Applications Irrigation systems n Medical gas delivery systems n Pump & compressor monitoring n Engine monitoring n 10 Machine tools n Metal working n Food & Beverage n General Industrial n

Product Review: Series 7000 n n n n Multiple electrical connections Control pressures from 1. 25 psi up to 3000 psi NEMA 1 & 4 UL recognized & CSA approved Factory set or field adjustable Accuracy: ± 0. 5% up to ± 8% Wetted parts: Brass, SS, Plastic Average list price: $35 - $70 Applications Pool & Spa Heaters n Beverage Dispensers n HVAC n Engine Monitoring n 11 Hydraulic Power Units n Pump or Compressor Control n Hydraulic & Pneumatic Braking Systems n Mobile Hydraulics n

Product Review: Series 96200 n n n n n Versatile with a wide pressure range Control pressures from vacuum up to 7500 psi NEMA 1 & 4; IP 65 UL recognized & CSA approved UL listed with optional fitting Factory set or field adjustable via external sleeve; tamper-resistant option Accuracy: ± 2% of full range Brass wetted parts; 416 SS optional Average list price: $66 - $145 Applications Pump & Compressor n Engine monitoring n Hydraulic power units n Machine tools n 12 HVAC n Engine monitoring n Mobile Hydraulics n

Application: Beverage Dispensers u u Product: MSPS Dia-seal switch Application: Monitoring supply in beverage dispensers n n Used in frozen beverage and coffee dispensers MSPS switch measures decreasing pressure When syrup or feed water pressure is below acceptable levels (35 psi), a “Sold Out” light is activated Satisfies critical requirements for this application: n n n 13 Compact size Low Cost High reliability Narrow deadband NSF approval Also available in vacuum

Application: Autoclave u u Product: E 1 S pressure switch Application: Industrial electric steam sterilizer Controls temperature based on pressure Higher pressure = higher temperature n n n Uses two E 1 S-F 15 When pressure reaches 13 -13. 5 psi, switch actuates to shut down 2 heaters, while energizing a relay to start countdown timer. Second switch controls cycling of heater on/off to maintain temperature (250ºF) E 1 S Pressure Switches 14

Application: Mobile Hydraulics u u u Product: Series 7000 compact pressure switch Application: Mobile Hydraulics Braking and Transmission System 4 switches used: n n n 15 Parking brake switch signals a warning light when supply pressure drops below 350 psi Two switches used to shift engine power to either transmission or brake Fourth switch is used on forklifts with hydraulic joystick to increase maneuverability

Application: Mobile Hydraulics u u u Product: Series 96200 compact pressure switch Application: World’s largest dump truck Brake system failsafe n n Monitors hydraulic pressure in brake circuit In case of main brake system failure, a signal is sent to the auxiliary storage system (hydraulic accumulators) to provide braking Series 96200 16

Coming Next Week u Week 3 n n n n 17 Complete Product Review Product Comparison New Product Preview Applications Customization Capabilities Bundling Opportunities Wrap-up

Contact Info CONTACT INFO Tech Support: Vu Lam Applications Engineer 323 -586 -3059 vlam@barksdale. com For Channel Partner support, contact your Regional Sales Manager: Vartan Minassian - West (818) 497 -6181 vminassian@barksdale. com Bryan Ritchey - Northeast (609) 444 -8543 britchey@barksdale. com Dan Badillo Applications Engineer 323 -586 -3068 dbadillo@barksdale. com Jeremy Smith - Midwest (630) 388 -8035 jsmith@barksdale. com Jim Hickman - Southeast (678) 654 -7641 jhickman@barksdale. com Chris Bode - Central (513) 600 -0904 cbode@barksdale. com Doug Mc. Mordie - Southwest (832) 247 -2244 dmcmordie@barksdale. com Rudy Van den Ende - Eastern Canada (416) 427 -6118 rvandenende@bcp-tech. com Robert Gasienica – Western Canada (403) 606 -3630 robert. gasienica@sigmaig. com 18